How to add an object with key:value pairs into an existing object in a schema

[jwalkerbg]

Here is my case. I have a validation schema, that have to receive key:value pairs from another json variable and put them, into its own existing properties object:

json j1 = R"XYZ({ "type":"object", "properties": { "tag": { "type": ["string","integer"]} } })XYZ"_json;

I have to add following content (example):
json j2 = R"XYZ({ "mode":{"type":"integer"}, "strength":{"type":"integer"} }, )XYZ"_json

The final result should be:

{ "type":"object", "properties": { "tag": { "type": ["string","integer"]}, "mode":{"type":"integer"}, "strength":{"type":"integer"} } }

I tried to use
j1["properties"] += j2; but this rises exception [json.exception.type_error.308] cannot use push_back() with object.

Thank for the answers that would come,
Ivan

[nlohmann]

You may want to look at https://json.nlohmann.me/api/basic_json/update/.

[jwalkerbg]

Thank you very much, my test succeeded using update(j1,true), however I still had to use one intermediate object. Here is my test for reference:

json j1 = R"XYZ({ "type":"object", "properties": { "tag": { "type": ["string","integer"]} } })XYZ"_json;
json j2 = R"XYZ({ "mode":{"type":"integer"}, "strength":{"type":"integer"} }, )XYZ"_json;
j3["properties"] = j2;
j1.update(j3,true);

[falbrechtskirchinger]

Is j1["properties"].update(j2) an option?

[jwalkerbg]

Yes, it succeeded too, and it is the right solution, obviously. Thank you.